Crank-shaft and bearing therefor.



E A NELSON CRANK SHAFT AND BEARING THEREFOR.

APPLICATION IILED FEB. 5, 1910. I

Patented Nov. 1, 1910.

Wi'fnessz s QzQW UNITED STATEE PATENT OFFICE.

EMIL A. NELSON, OF DETROIT, MICHIGAN, ASSIGNOR TO ROTARY VALVR MOTOR COM- PANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

CRANK-SHAFT AND BEARING THEREFOR.

To all whom it may concern:

Be it known that I, EMIL A. NELSON, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Crank- Shafts and Bearings Therefor, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to engines, and more particularly to explosion engines, in which the crank shaft is inclosed in a crank casing.

It is the object of the invention to provide a construction of twopart crank shaft, which is provided with a central and friction bearing for engaging support ng bearings in the crank case, and the lnventlon consists in the construction as hereinafter set forth.

In the drawings-Figure l is a longitudinal section through the adjoining ends of the crank shaft sections and bearing; Fig. 2 is a cross section.

A and B are the two sections of the crank shaft, which are provided with adjacent alined cranks C and C.

D and D are the arms of the cranks at the adjoining ends, each of which is provided with a hub or boss E concentric with the axis of the shaft. One of these hubs E is centrally apertured at F, while the other hub is provided with a pin G for engaging said aperture and threaded at its outer end to engage a clamping nut H.

I is an annular recess for a ball hearing, which surrounds the adjoining hub E.

J are balls in the recess I, and K is an outer ball race, which peripherally fits a bearing L in the crank case, this bearing being of sufficient diameter to permit of the withdrawal of the crank therethrough. For locking the sections A and B to each other, and hold the cranks in alinement, keys are arranged to engage longitudinal key seats in the adjoining hub sections E, woodruif keys M being preferably employed. These are retained by the race I and when the nut H is clamped both sections ofthe crank are rigidly attached to each other.

What I claim as my invention is:

1. A crank shaft, formed in two sections having adjacent cranks abutting bosses on said cranks concentric with the axis of the Specification of Letters Patent.

Application filed February 5, 1910.

Patented Nov. 1, 1910. Serial No. 542,192.

shaft, a key engaging a radial key seat in said bosses, and a ball race surrounding said bosses and retaining said key.

2. A crank shaft comprising two sections having adjacent cranks, abutting bosses on said cranks concentric with the axis of the shaft, a pin projecting from one boss engaging a corresponding recess in the other, a key engaging a radial key seat in the pe riphery of said bosses, and a ball bearing mounted upon and surrounding said bosses forming a retaining means for said key.

3. A crank shaft comprising two sections having adjacent abutting bosses on said cranks concentric with the axis of the shaft, a pin projecting centrally from one of said bosses and passing through a corresponding aperture in the other boss, a clamping nut having a threaded engagement with the end of said pin, a key engaging a radial key seat in the periphery of said bosses, and a ball bearing mounted upon said bosses and retaining said key in its seat.

7 4. A crank shaft comprising two sections having adjacent cranks, abutting bosses on said cranks, a plurality of keys engaging radial recesses in the periphery of said bosses, and a ball bearing mounted upon said bosses and retaining said keys.

5. A crank shaft comprising two sections having adjacent cranks, abutting bosses on said crank concentric with the axis of the shaft, a plurality of segmental keys engaging corresponding key seats in the periphery of said bosses, and a ball bearing mounted on said bosses and retaining the same.

6. A crank shaft comprising two sections having adjacentcranks, abutting bosses on said cranks concentric with the axis of the shaft, a projecting portion on one of said bosses of lesser dlameter than said bosses and engaging an aperture in the adjacent member, a plurality of segmental keys engaging corresponding key seats in the periphery of said bosses, and a ball bearing jpounted upon said bosses and retaining said eys.

In testimony whereof I affix my signature in presence of two witnesses.

EMIL A. NELSON. Witnesses W. J. BELKNAP, NELLIE KINSELLA. 

